This Nitto example shimmed down from 28.6 for the 25.4 steerer won’t win any aesthetic awards but to me it’s not completely out-of-place on my c. 2005 Alberto Masi. If I cared more I’d remove the branding but it’s what it is.
In my mind this is what threadless stems are up against and this is about as good as it gets…
Nitto also do what I reckon is a pretty fine CNC-machined threadless stem which looks ok in certain situations…